Rotary steam-valve.



s. W. PERRY. ROTARY STEAM VALVE.

APPLIOATION FILED SEPT. 21, 1909.

967,827. Patented Aug. 16,A 1910.

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967,827. Patented Aug.'16, 1910.

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ROTARY STEAM-VALVE.

Specification of Letters Patent.

Patented Aug. 16, 1910.

Application led September 21, 1909. Serial No. 518,779.

To all whom t may concern:

Be it known that I, SooTT W. PERRY, a citizen o-f the United States,residing at Versailles, in the county of Brown and State of Illinois,have invented certain new and useful Improvements in RotarySteam-Valves, of which the following is a specification.

This invention relates to steam engines, and more particularly tovalves, and has for its object to pro-vide a rotary valve of a novel andsimple type.

A particular object of the invention is to provide a valve soconstructed that the pressure of steam therein will hold it firmlyseated to prevent the loss of steam therearound.

Another object is to provide a novel form of valve casing of simpleconstruction and having a novel form of seating for the valve.

Another object is to provide such a device in which a novel form ofexhaust is provided.

Other objects and advantages will be apparent from the followingdescription, and it will be understood that changes in the specificstructure shown and described may be made within the scope of the claimswithout departing from the spirit of the invention.

In the drawings forming a portion of this specification, and in whichlike numerals of reference indicate similar parts in the several views,Figure 1 is a perspective view of the valve member in this device, Fig.2 is a longitudinal sectional view of the valve and casing in assembledorder, Fig. 3 is a cross section through the end of the valve on theline 3 3 of Fig. 2, Fig. 4 is a cross section through the valve casingwith the valve removed, and showing fragmentary portions of coengagedengine cylinders, Fig. 5 is a perspective view of one of the heads ofthe valve casing. Fig. 6 is a longitudinal section of a modified form ofvalve and steam chest, Fig. 7 is a cross section of the modification.

Referring to the drawings, there is shown a casing 10 comprising acylinder 11, and oppositely disposed heads 12 of a similar Construction,secured to the flanges 13 carried upon the cylinder 11. The heads 12 areplane o-n their inner faces, to provide a seating surface for the valvesubsequently to be described. Formed centrally of each head there is anexhaust opening or port 14.

Formed in the seat faces of the heads 12, there are valve ports 16 fromwhich extend passages 17 communicating respectively with openings 18formed in flanged eXtensions 19 on opposite sides of the heads adaptedto be secured upon similar portions of steam engine cylinders C asshown. It will be noted that the ports 16 are disposed in quarteredrelation with respect to the center of the head, though it will beunderstood that any suitable spacing may be utilized which may be' founddesirable. From the extension upon the cylinders C as shown, there areports 21 opening into the cylinders as shown.

Engaged revolubly in the cylinder 1l, there is a valve 15 having planeends disposed snugly against the `seat faces of the heads 12, the valvebeing split at its center as shown at 22 the opposite sections beingprovided with sockets 23 receiving projections 24 slidably therein,against springs 25 seated at the inner ends of the recesses 23. Thesprings thus bear outwardly against these sections to hold them normallyin seated 4engagement with the inner faces of the heads 12.

Formed in the end faces of the opposite sections of the valvel, thereare segmental recesses 25 disposed on opposite sides of the aXis of thevalve and adapted to register at times with the ports 16. It will benoted that the valve is reduced or attenuated throughout its centralportion, providing a central chamber 26 therearound within the cylinder11. Opening from the recesses 25 into the chamber 26 there are passages27. Communicating centrally with the cylinder 11, there is an inletpassage 28 for the admission of steam. It will thus be seen that uponadmission of steam through the passage 28 it will circulate freelyaround the valve, the pressure thereof tending to distend or separatethe sections and force them against the opposed seat faces of the heads12. The steam enters the passages 27, and upon rotation of the valve isadmitted alternately to the sets of ports 16 in the 0pposite ends of thecasing.

Formed in the end faces of the valve 15 there are sector-shaped recesses30, one radial edge of which ,is spaced from one end of the recess 25slightly more than the width of the ports 16, as shown in Fig. 3, theopposite radial edge of the recess is disposed immediately adjacent aline drawn diametriallyacioss the valve in registry with the end of therecess 25 adjacent the recess 30. The length of the recess 25 may bevaried to govern the period of admission of steam tothe cylinders, asdesired. The recess 30 is positioned to register with and allow theescape of steam through the ports 16 at one end of the valve during theadmission of steam through the ports at the opposite end and thereafterfor a proper period, as will be readily understood by those versed inthe art. The central portion of each recess 30 communicates with theexhaust passage 14 atall times, and is slightly enlarged by thesemicircular extension 3l to allow its full registry with the exhaustopening.

Secured to one end of the valve there is an axial shaft 35 extendinglcentrally through the adjacent opening 14 and extendingthrough asupplementary casing 36 secured to the head l2 and carrying an exhaustpipe 37 for the conduction of exhaust steam from the valve as will beunderstood. The shaft is geared to the driven shaft 3S as shown at B,for rotation coincidently l'with the driven shaft.

By the construction shown, the valve alternately admits live steam tothe engine cylinders, and conducts exhaust `steam therefrom in aneflicient manner. The valve itself comprises but twosimple part-s andthe casj ing therefor comprises but three parts, all

of which are adapted to be constructed in the simplest possible manner,and it will be seen that no adjustments of the valve will be necessaryto compensate for wear. It will be seen that in operation the oppositesections of the valve member are longitudinally movable in the cylinderl1 and relatively; and under action of steam and the springs 23, will beheld at all times in snug contact with the seat faces of the heads l2.It will be understood that the form of the chamber within which thevalve operates may be changed as desired, and in Figs. 6 and 7 there isshown a chest 40 formed in- Y tegral with the heads, said chest beingrecj engagement with the valve seat.

tangular'in cross section. In this form also the valve member is madewithout the use of springs for retaining .it in rm seated The shaftcarrying the valve is rectangular in cross section where it is securedto the valve and the valve is made in two sections having opposedthreaded recesses and a stub sleeve having right and left handed threadsin coengagement therebetween for adjustment of ithe valve in snugcontact with the seats.

What .is claimed is: 1. Avalve of the class described comprisj ing acylindrical casing having heads provided with ports in their inner facesand having passages communicating with the ports and opening laterallyof the head for Y, j j A j 967,82?

con'iiiiunication with engine cylinders, said heads having centralexhaust openings there; through, and a valve member revoluble within thecasing and comprising opposite sections relatively movablelongitudinally of the casing, resilient means engaged between thesections to press them resiliently against the heads, said valve memberbeing peripherally reduced centrally to provide a circumscribing steamchamber, a steam inlet means communicating with the casing centrallythereof, said valve having segmental recesses respectively in its endfaces adapted to register at times with the ports in the heads andpassages communicating with the central reduced portion of the valve andopening into the segmental recesses; said valve having alsosector-shaped recesses respectively in each end spaced from the firstnamed recesses and adapted to register synchronously with the respectiveports and exhaust openings in the heads, and means for rotating thevalve.

2. A valve of the class described comprising a cylindrical casing havingcentrally perforated heads at each end, said heads having ports openingthrough their inner faces and having passages extending laterallytherefrom, and a valve member revoluble Wit-hin the casing and formingwith the casing aforesaid a central steam chamber provided with apassage opening through the end of the valve and adapted to register attimes with the ports, said valve having also a sector-shaped recess inits end adapted to register synchronously with the orts and perforationin the heads alternate y of the registration of the last named passageand ports.

3. A valve of the class described compris ing a cylindrical casing andported hea s, a revoluble valve member engaged revolubly within thecasing and comprising op osite sections relatively movablelongitudinally of the casing, resilient means engaged between thesections to hold them resiliently against the heads, said valve forminga central steam chamber with the casing and passages opening therefromthrough the ends of the valve for registry with the ports at times, saidvalve having also recesses in its ends adapted to register synchronouslywith certain of the ports in the heads at other times, steam inlet meanscommunicating with the casing, and means for rotating the valve.

4. A valve of the class described comprising a cylindrical casing andported heads, a revoluble valve member engaged revolubly within thecasing and comprising opposite sections relatively movablelongitudinally of the casing, and adapted to be forced against the headsby a fluid power medium, said valve forming a central steam chamber withthe casing and passages opening therefrom through the ends of the valvefor registry teaser s 'with the ports at times, said valve having alsorecesses in its ends adapted to register synchronously With certain ofthe ports in the heads at other times, steam inlet means communicatingWith the casing, and means for rotating the valve.

5. A rotary valve comprising a casing, ported heads therefor, a valvemember revoluble in said casing, said valve comprising opposite sectionsrelatively movable longitudinally in the casing, said valve forming achamber intermediate of the casing and the valve, said valve also havingpassages communicating with the ports at the time, the ends of saidvalve being provided with recesses adapted to register with the saidports in the heads, said casing being also provided with an inlet portand a shaft rigidly connected with the valve whereby the same may berotated.

6. A rotary valve comprising a casing and ported heads, a valverevoluble in the casing, said valve forming a central steam chamber withthe casing and being provided with passages communicating With the portsin the heads intermittently, the ends of said valve being provided Withrecesses adapted to similarly register With the ports', said casingbeing provided with supply inlet means, a supplementary casing on one ofthe heads, said heads and casing being provided With exhaust ports and ashaft carried by the valve and having bearings in the casing secured tothe heads and means for rotating the shaft.

7. A valve of the class described comprising a casing and ported heads,a valve rotatable in the casing and comprising oppositely disposedsections, means for forcing said sections against the heads aforesaid,said casing being provided with a supply inlet port, said valve beingprovided with passages communicating with the port-s in the head andrecesses intermediate of said passages and ports, said recesses andports adapted to register' with said passages during the rotation of thevalve and means for rotating the valve.

In testimony whereof I amx my signa* ture, in presence of tWo Witnesses.

SCOTT W. PERRY. lVitnesses GRACE MYERS, C. H. SMITH.

